Statistical Measurement [Domain] Statistical Measurement [Domain] Restricted cash included in other current assets Restricted Cash, Current Award Timing Predetermined Award Timing Predetermined [Flag] Schedule of Other Current Assets Schedule Of Other Current Assets [Line Items] Schedule Of Other Current Assets [Line Items] Entity File Number Entity File Number Additional paid-in capital Additional Paid-in Capital [Member] Tabular List, Table Tabular List [Table Text Block] Numerator Earnings Per Share, Basic [Abstract] Schedule of Capitalization, Long-term Debt Schedule of Capitalization, Long-Term Debt [Line Items] Accounts payable Increase (Decrease) in Accounts Payable Weighted average stock options Share-Based Payment Arrangement [Member] Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Interchange Interchange [Member] Interchange Basic (in dollars per share) Net loss per share, basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other Other Assets, Miscellaneous, Current Shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance REVENUE AND CERTAIN STATEMENT OF OPERATIONS COMPONENTS Revenue from Contract with Customer [Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount 2022 Share Repurchase Program 2022 Share Repurchase Program [Member] 2022 Share Repurchase Program [Member] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Total stockholders' equity Beginning balance Ending balance Equity, Attributable to Parent Settlement of liability-classified restricted stock units Settlement of Liability-Classified Restricted Stock Units [Member] Settlement of Liability-Classified Restricted Stock Units Insider Trading Policies and Procedures [Line Items] Total stock-based compensation expense Share-Based Payment Arrangement, Expense Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Issuance of common stock under Matching Plan (in shares) Stock Issued During Period, Shares, Employee Benefit Plan Total liabilities and stockholders' equity Liabilities and Equity Loss on impairment, receivables and sale or disposal of equipment Gain (Loss) On Impairment, Receivables And Sale Or Disposal Of Equipment Gain (Loss) On Impairment, Receivables And Sale Or Disposal Of Equipment Antidilutive Securities Excluded from Computation of Earnings Per Share Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Number of shares purchased (in shares) Stock Issued During Period, Shares, Employee Stock Ownership Plan Liabilities and stockholders' equity Liabilities and Equity [Abstract] Cover [Abstract] Maximum Maximum [Member] General and administrative General and Administrative Expense [Member] Options exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Fair value of common stock issued to settle liability-classified restricted stock units Common Stock Issued to Settled Restricted Stock Liability Common Stock Issued to Settled Restricted Stock Liability Accounting Policies [Abstract] Revenue Recognition and Deferred Revenue [Abstract] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company Other liabilities Other Liabilities, Noncurrent Statement of Stockholders' Equity [Abstract] Stock-based compensation capitalized as software development costs Less: stock-based compensation capitalized as software development costs Share-Based Payment Arrangement, Amount Capitalized Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Schedule of Other Current Assets Schedule of Other Current Assets [Table Text Block] Name Measure Name Accrual for uncertain tax positions Accrued Income Taxes, Noncurrent Schedule of Stock-based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Classification of Award [Domain] Classification of Award [Domain] Classification of Award [Domain] Other Other Accounts Payable and Accrued Liabilities Document Fiscal Period Focus Document Fiscal Period Focus Award Timing Method Award Timing Method [Text Block] Furniture and fixtures Furniture and Fixtures [Member] Award Type [Axis] Award Type [Axis] Vesting of early exercised stock options Adjustments To Additional Paid In Capital, Value, Vesting Of Early Exercised Stock Options Adjustments To Additional Paid In Capital, Value, Vesting Of Early Exercised Stock Options Total assets Assets Trading Symbol(s) Trading Symbol Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Geographical [Domain] Geographical [Domain] Entity Address, City Entity Address, City or Town LT10 Common Stock, LT10 [Member] Common Stock, LT10 Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] GENERAL INFORMATION Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Equity-classified restricted stock units Restricted Stock Units (RSUs) [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Nonstatutory Options Non Statutory Options [Member] Non Statutory Options [Member] Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Common stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Annual increase in shares reserved for future issuance (as a percent) Annual Increase In Shares Reserved For Issuance As A Percentage Of Common Shares Outstanding Annual Increase In Shares Reserved For Issuance As A Percentage Of Common Shares Outstanding Plan Name [Axis] Plan Name [Axis] Document Information [Table] Document Information [Table] PEO PEO [Member] Investment income, interest Investment Income, Interest Noncash investing and financing items: Noncash Investing and Financing Items [Abstract] Income taxes Accrued Income Taxes, Current United States UNITED STATES Changes in assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Issuance of common stock on exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Proceeds from issuance of common stock upon exercise of stock options Proceeds from Issuance or Sale of Equity Accumulated deficit Retained Earnings [Member] RSU Rollforward Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Cash and cash equivalents and restricted cash, beginning of period Cash and cash equivalents and restricted cash, end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Benefit from (provision for) income taxes Provision (benefit) for income Income Tax Expense (Benefit) Variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Sales, payroll and other taxes Taxes Payable, Current Document Information Document Information [Line Items] Preferred stock. shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service [Domain] Product and Service [Domain] Total property and equipment Property, Plant and Equipment, Gross Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Earned interchange restricted cash Earned Interchange Restricted Cash Earned Interchange Restricted Cash Other current assets Increase (Decrease) in Other Current Assets Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Equity, Class of Treasury Stock Equity, Class of Treasury Stock [Line Items] Proceeds from issuance of common stock upon exercise of stock options Proceeds from Stock Options Exercised City Area Code City Area Code Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Mortgages Mortgages [Member] Class of Treasury Stock [Table] Class of Treasury Stock [Table] Software development costs Payments to Develop Software Beginning balance (in shares) Ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] 2021 Incentive Plan The 2021 Incentive Plan [Member] The 2021 Incentive Plan Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] General and administrative General and Administrative Expense Share-based compensation expense not yet recognized Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Schedule of Stock Option Roll-forward Schedule of Stock Options Roll Forward [Table Text Block] Debt instrument, term (in years) Debt Instrument, Term Related Party Transactions [Abstract] Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Preferred stock, par value ( in dollars per share) Preferred Stock, Par or Stated Value Per Share Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Cost of revenue, net Cost of Sales [Member] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Depreciation Depreciation Weighted average shares of common stock used to compute net loss per share: Denominator Weighted Average Number of Shares Outstanding, Basic [Abstract] Equity Components [Axis] Equity Components [Axis] Property, Plant and Equipment Property, Plant and Equipment [Line Items] All other locations Non-US [Member] Issuance of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Gross Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Number of reportable segments Number of Reportable Segments Fair value of common stock issued to settle liability-classified restricted stock units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid Other Performance Measure, Amount Other Performance Measure, Amount Weighted average exercise price per share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Payments for debt issuance costs Payments of Debt Issuance Costs Entity Address, State Entity Address, State or Province Principal payments of finance leases Finance Lease, Principal Payments Reduction of operating lease right-of-use assets Operating Lease, Impairment Loss Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Total current liabilities Liabilities, Current Issuance of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Individual: Individual [Axis] Other current assets Other current assets Other Assets, Current Research and development Research and Development Expense [Member] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Partner payouts and advertising fees Accrued Partner Payouts And Advertising Fees, Current Accrued Partner Payouts And Advertising Fees, Current Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Basis of Presentation and Principles of Consolidation Basis of Accounting, Policy [Policy Text Block] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Principal payments of outstanding debt Repayments of long term debt Repayments of Long-Term Debt Effective income tax rate (in percent) Effective Income Tax Rate Reconciliation, Percent Entity Interactive Data Current Entity Interactive Data Current Plan Name [Domain] Plan Name [Domain] Share-based compensation not yet recognized, recognition period (in years) Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Issuance of common stock on exercise of stock options (in shares) Options exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Equity [Abstract] Equity [Abstract] Commercial building Building [Member] Settlement assets, net Settlement Assets, Current Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Increase (Decrease) in Stockholders' Equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Classification of Award [Axis] Classification of Award [Axis] Classification of Award Other restricted cash Other Restricted Cash Current Other Restricted Cash Current Deferred tax assets, net Deferred Income Tax Assets, Net Stock repurchased value Stock Repurchased During Period, Value Expensify Card posted collateral for funds held for customers Card Collateral For Funds Held For Customers, Current Card Collateral For Funds Held For Customers, Current Depreciation and amortization Depreciation, Depletion and Amortization Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Supplemental disclosure of cash flow information: Supplemental Cash Flow Elements [Abstract] Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Arrangement Duration Trading Arrangement Duration Cashback rewards Contract with Customer, Liability, Current Computers and equipment Computer Equipment [Member] Exercise Price Award Exercise Price 2021 Stock Plan 2021 Stock Plan [Member] 2021 Stock Plan Entity Filer Category Entity Filer Category Local Phone Number Local Phone Number Class of Stock [Domain] Class of Stock [Domain] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] STOCK INCENTIVE PLANS Share-Based Payment Arrangement [Text Block] Repurchase and retirement of common stock (in shares) Stock Repurchased and Retired During Period, Shares Assets Assets [Abstract] Credit Facility [Axis] Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Debt Instrument [Axis] Debt Instrument [Axis] Cancelled/forfeited/expired (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Credit Facility [Domain] Credit Facility [Domain] Stockholders' equity: Equity, Attributable to Parent [Abstract] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Entity Address, Street Entity Address, Address Line One Research and development Research and Development Expense Interest rate (as a percent) Debt Instrument, Interest Rate, Stated Percentage Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Consideration from a vendor, net Consideration From Vendors, Net Consideration From Vendors, Net Fair Value as of Grant Date Award Grant Date Fair Value Entity Registrant Name Entity Registrant Name Other assets Increase (Decrease) in Other Noncurrent Assets Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Amortization expense Capitalized Computer Software, Amortization Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Title of Individual [Domain] Title and Position [Domain] Cancelled/forfeited/expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Share-based payment arrangement, nonvested award, cost not yet recognized, amount Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Document Quarterly Report Document Quarterly Report Deferred tax assets Deferred Income Taxes and Tax Credits Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted average remaining contractual life, options outstanding (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Accrued Expenses and Other Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Restatement Determination Date: Restatement Determination Date [Axis] Non-PEO NEO Non-PEO NEO [Member] Intrinsic value of options outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Land Land [Member] Name Trading Arrangement, Individual Name Award Type [Domain] Award Type [Domain] Equity Awards Adjustments Equity Awards Adjustments [Member] Leasehold improvements Leasehold Improvements [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue Disaggregation of Revenue [Line Items] Compensation Amount Outstanding Recovery Compensation Amount Loaned amount Debt Instrument, Face Amount Conversion of stock, notice period (in months) Conversion of Stock, Notice Period Conversion of Stock, Notice Period Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Preferred stock Preferred Stock [Member] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Other Than Ten Percent Holder Other Than Ten Percent Holder [Member] Other Than Ten Percent Holder Schedule of Other Current Assets [Table] Schedule Of Other Current Assets [Table] Schedule Of Other Current Assets [Table] Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Voting right per share (vote) Common Stock, Voting Right Per Share Common Stock, Voting Right Per Share Deferred contract acquisition costs Deferred Contract Acquisition Costs Deferred Contract Acquisition Costs Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Sales and marketing Selling and Marketing Expense Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Line of credit, current Line of Credit, Current Minimum Minimum [Member] Repurchases of early exercised stock options Payments For The Repurchases Of Early Exercised Stock Options Payments For The Repurchases Of Early Exercised Stock Options Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Company Selected Measure Name Company Selected Measure Name 2024 Amended Term Loan Amended 2024 Term Loan [Member] Amended 2024 Term Loan Preferred stock, par value $0.0001; 10,000,000 shares authorized as of June 30, 2025 and December 31, 2024; no shares issued and outstanding as of June 30, 2025 and December 31, 2024 Preferred Stock, Value, Issued Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Proceeds from common stock purchased under Matching Plan Proceeds from Stock Plans Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Net loss, diluted Net loss, diluted Net Income (Loss) Available to Common Stockholders, Diluted All Executive Categories All Executive Categories [Member] Total stock-based compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount Less: accumulated amortization Capitalized Computer Software, Accumulated Amortization Common stock issued, value Common Stock, Value, Issued Matching Plan payroll liability Employee Stock Purchase Plan Payroll Liability Employee Stock Purchase Plan Payroll Liability COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Title of Individual [Axis] Title and Position [Axis] Diluted (in shares) Weighted average shares of common stock used to compute net loss per share, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Volume-based incentives income Volume-Based Incentive Income Volume-Based Incentive Income Segment Reporting Segment Reporting, Policy [Policy Text Block] Commitments and contingencies (Note 4) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Entity Small Business Entity Small Business Sales and marketing Selling and Marketing Expense [Member] Capitalized software development costs Capitalized Computer Software, Gross Schedule of Revenue from Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Income Tax Disclosure [Abstract] Preferred stock, shares outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Preferred Stock, Shares Outstanding Document Transition Report Document Transition Report Issuance of common stock in connection with restricted stock units vesting (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Units Vesting Stock Issued During Period, Shares, Restricted Stock Award, Units Vesting Underlying Securities Award Underlying Securities Amount Equity Component [Domain] Equity Component [Domain] Document Period End Date Document Period End Date PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Options cancelled/forfeited/expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period INCOME TAXES Income Tax Disclosure [Text Block] CERTAIN BALANCE SHEET COMPONENTS Supplemental Balance Sheet Disclosures [Text Block] Class A Common Stock Class A Common Class A [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Liability Classfied Liability Classfied [Member] Liability Classfied Weighted average remaining contractual life, options exercisable (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Operating lease liabilities Increase (Decrease) in Operating Lease Liability Document Type Document Type NET LOSS PER SHARE Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Additional paid-in capital Additional Paid in Capital Accrued expenses and other liabilities Accrued expenses and other liabilities Accounts Payable and Other Accrued Liabilities, Current Capitalization, Long-Term Debt [Table] Capitalization, Long-Term Debt [Table] Product and Service [Axis] Product and Service [Axis] Cash proceeds Proceeds from Issuance of Common Stock Revenue Revenue from Contract with Customer, Excluding Assessed Tax Share-based compensation arrangement by share-based payment award, award requisite service period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period Matching Plan shares Matching Plan shares Matching Plan [Member] Matching Plan All Individuals All Individuals [Member] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Shares authorized for repurchase Share Repurchase Program, Authorized, Amount Options cancelled/forfeited/expired (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Reconciliation of cash and cash equivalents and restricted cash to the Condensed Consolidated Balance Sheets Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Purchase price as a percentage of common stock (as a percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Issuance of common stock under Matching Plan Stock Issued During Period, Value, Employee Benefit Plan Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net loss, basic Net loss, basic Net Income (Loss) Available to Common Stockholders, Basic Cashback rewards Revenue From Contract With Customer, Cash Rewards To Customer Revenue From Contract With Customer, Cash Rewards To Customer Settlement assets, net Increase (Decrease) in Settlement Assets Increase (Decrease) in Settlement Assets Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Share Repurchase Program [Domain] Share Repurchase Program [Domain] Matching Plan - Discretionary Contributions Matching Plan Discretionary Contributions [Member] Matching Plan Discretionary Contributions Geographical [Axis] Geographical [Axis] Total operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Share-based payment arrangement, expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Diluted (in dollars per share) Net loss per share, diluted (in dollars per share) Earnings Per Share, Diluted Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Title of each class Title of 12(b) Security Schedule of Capitalized Software, Net Schedule Of Capitalized Software Development Costs [Table Text Block] Schedule Of Capitalized Software Development Costs [Table Text Block] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Net loss per share: Earnings Per Share [Abstract] Shares converted (in shares) Conversion of Stock, Shares Converted Prepaid expenses Increase (Decrease) in Prepaid Expense Gross margin Gross Profit Schedule of Anti-dilutive Securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Repurchase and retirement of common stock Stock Repurchased and Retired During Period, Value Restricted cash included in settlement assets, net Restricted Cash Included In Settlement Assets Restricted Cash Included In Settlement Assets Cash paid for income taxes Income Taxes Paid, Net Options exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Award Timing Disclosures [Line Items] Matching Plan 1/20th Share Issuance Matching Plan One Twentieth Issuance [Member] Matching Plan One Twentieth Issuance The 2019 Option Plan The 2019 Option Plan [Member] The 2019 Option Plan Subsidiaries Subsidiaries [Member] EQUITY Equity [Text Block] Expensify.org restricted cash Restricted Cash Held For Related Party, Current Restricted Cash Held For Related Party, Current Net loss Net loss Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Construction in progress Construction in Progress [Member] Other liabilities Increase (Decrease) in Other Operating Liabilities The 2009 Option Plan The 2009 Option Plan [Member] The 2009 Option Plan Vesting period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Taxes payable Taxes Payable Repurchase and retirement of common stock Payments for Repurchase of Common Stock Adoption Date Trading Arrangement Adoption Date Shares purchase price (in dollars per share) Shares Issued, Price Per Share Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Accounts receivable, net Increase (Decrease) in Accounts Receivable Entity Current Reporting Status Entity Current Reporting Status Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] (Loss) income from operations Operating Income (Loss) Line of Credit Line of Credit [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Accumulated deficit Retained Earnings (Accumulated Deficit) Statement of Financial Position [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Executive Category: Executive Category [Axis] Ten Percent Holder Ten Percent Holder [Member] Ten Percent Holder Current Fiscal Year End Date Current Fiscal Year End Date Class of Stock [Axis] Class of Stock [Axis] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Weighted average grant date fair value per share Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Other income (expenses), net Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Adjustments to reconcile net loss to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Earnings Per Share, Basic, by Common Class, Including Two-Class Method [Table] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Antidilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Lease liabilities, non-current Lease Liability, Non-Current Lease Liability, Non-Current Shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Software Development Software Development [Member] Termination Date Trading Arrangement Termination Date Net cash (used in) provided by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Lease right-of-use assets Right Of Use Assets Right Of Use Assets Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Basic (in shares) Weighted average shares of common stock used to compute net loss per share, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Share repurchase program, remaining authorized, amount Share Repurchase Program, Remaining Authorized, Amount Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Options exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Cost of revenue, net Cost of Revenue Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Schedule of RSU Rollforward Schedule of Unvested Restricted Stock Units Roll Forward [Table Text Block] Amortization of original issue discount and debt issuance costs Amortization of Debt Issuance Costs Entity Tax Identification Number Entity Tax Identification Number Credit card processing fees Accrued Credit Card Processing Fees, Current Accrued Credit Card Processing Fees, Current Expensify.Org Expensify.Org [Member] Expensify.Org Beginning balance (in dollars per share) Ending balance (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-based Compensation Arrangement by Share-based Payment Award Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Consolidated Entities [Axis] Consolidated Entities [Axis] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share LT50 Common Stock LT50 Common Stock, LT50 [Member] Common Stock, LT50 Common stock, shares issued (in shares) Common Stock, Shares, Issued Income tax receivable Income Taxes Receivable, Current Options granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Settlement of liability-classified restricted common shares (in shares) Stock Issued During Period Shares Settlement Of Liability Restricted Stock Award Stock Issued During Period Shares Settlement Of Liability Restricted Stock Award Use of Estimates Use of Estimates, Policy [Policy Text Block] Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Equity Classified Equity Classified [Member] Equity Classified Lease liabilities, current Lease Liability, Current Lease Liability, Current Insider Trading Arrangements [Line Items] Name of each exchange on which registered Security Exchange Name Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Settlement liabilities Increase (Decrease) in Settlement Liabilities Increase (Decrease) in Settlement Liabilities Settlement liabilities Settlement Liabilities, Current Purchases of property and equipment and capitalized software in accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Capitalized software, net Capitalized software, net Capitalized Computer Software, Net Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Repurchases of early exercised stock options (in shares) Shares repurchased (in shares) Stock Repurchased During Period, Shares Operating expenses: Operating Expenses [Abstract] Prepaid expenses Prepaid Expense, Current Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Statement [Line Items] Statement [Line Items] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Additional shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Employer share match rate (as a percent) Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Shares Matched By Employer Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Shares Matched By Employer Common stock Common Stock [Member] Vested (in shares) Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Entity Incorporation, State Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Net increase in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Professional fees Accrued Professional Fees, Current